diff options
Diffstat (limited to 'ipc/shm.c')
| -rw-r--r-- | ipc/shm.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/ipc/shm.c b/ipc/shm.c index b125b560240e..c0a021f7f41a 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -368,14 +368,14 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params) file = hugetlb_file_setup(name, size); shp->mlock_user = current_user(); } else { - int acctflag = VM_ACCOUNT; + int acctflag = 0; /* * Do not allow no accounting for OVERCOMMIT_NEVER, even * if it's asked for. */ if ((shmflg & SHM_NORESERVE) && sysctl_overcommit_memory != OVERCOMMIT_NEVER) - acctflag = 0; + acctflag = VM_NORESERVE; file = shmem_file_setup(name, size, acctflag); } error = PTR_ERR(file); @@ -440,7 +440,7 @@ static inline int shm_more_checks(struct kern_ipc_perm *ipcp, return 0; } -asmlinkage long sys_shmget (key_t key, size_t size, int shmflg) +SYSCALL_DEFINE3(shmget, key_t, key, size_t, size, int, shmflg) { struct ipc_namespace *ns; struct ipc_ops shm_ops; @@ -621,7 +621,7 @@ out_up: return err; } -asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf) +SYSCALL_DEFINE3(shmctl, int, shmid, int, cmd, struct shmid_ds __user *, buf) { struct shmid_kernel *shp; int err, version; @@ -939,7 +939,7 @@ out_put_dentry: goto out_nattch; } -asmlinkage long sys_shmat(int shmid, char __user *shmaddr, int shmflg) +SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg) { unsigned long ret; long err; @@ -955,7 +955,7 @@ asmlinkage long sys_shmat(int shmid, char __user *shmaddr, int shmflg) * detach and kill segment if marked destroyed. * The work is done in shm_close. */ -asmlinkage long sys_shmdt(char __user *shmaddr) +SYSCALL_DEFINE1(shmdt, char __user *, shmaddr) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma, *next; @@ -990,6 +990,7 @@ asmlinkage long sys_shmdt(char __user *shmaddr) */ vma = find_vma(mm, addr); +#ifdef CONFIG_MMU while (vma) { next = vma->vm_next; @@ -1034,6 +1035,17 @@ asmlinkage long sys_shmdt(char __user *shmaddr) vma = next; } +#else /* CONFIG_MMU */ + /* under NOMMU conditions, the exact address to be destroyed must be + * given */ + retval = -EINVAL; + if (vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) { + do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start); + retval = 0; + } + +#endif + up_write(&mm->mmap_sem); return retval; } |